EP1984161B1 - Receiving system - Google Patents

Receiving system Download PDF

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Publication number
EP1984161B1
EP1984161B1 EP07704510.2A EP07704510A EP1984161B1 EP 1984161 B1 EP1984161 B1 EP 1984161B1 EP 07704510 A EP07704510 A EP 07704510A EP 1984161 B1 EP1984161 B1 EP 1984161B1
Authority
EP
European Patent Office
Prior art keywords
hollow body
molding
receiving
receiving finger
body molding
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Not-in-force
Application number
EP07704510.2A
Other languages
German (de)
French (fr)
Other versions
EP1984161A1 (en
Inventor
Wolfgang PÜST
Rolf Steinmetz
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
MHT Mold and Hotrunner Technology AG
Original Assignee
MHT Mold and Hotrunner Technology AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by MHT Mold and Hotrunner Technology AG filed Critical MHT Mold and Hotrunner Technology AG
Publication of EP1984161A1 publication Critical patent/EP1984161A1/en
Application granted granted Critical
Publication of EP1984161B1 publication Critical patent/EP1984161B1/en
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C45/00Injection moulding, i.e. forcing the required volume of moulding material through a nozzle into a closed mould; Apparatus therefor
    • B29C45/17Component parts, details or accessories; Auxiliary operations
    • B29C45/72Heating or cooling
    • B29C45/7207Heating or cooling of the moulded articles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6463Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00Making preforms
    • B29B11/06Making preforms by moulding the material
    • B29B11/08Injection moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29BPREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
    • B29B11/00Making preforms
    • B29B11/14Making preforms characterised by structure or composition
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/16Cooling
    • B29C2035/1658Cooling using gas
    • B29C2035/1666Cooling using gas dried air
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C2049/023Combined blow-moulding and manufacture of the preform or the parison using inherent heat of the preform, i.e. 1 step blow moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/0715Preforms or parisons characterised by their configuration the preform having one end closed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/072Preforms or parisons characterised by their configuration having variable wall thickness
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/073Preforms or parisons characterised by their configuration having variable diameter
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/076Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0772Closure retaining means
    • B29C2949/0773Threads
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/076Preforms or parisons characterised by their configuration characterised by the shape
    • B29C2949/0768Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform
    • B29C2949/077Preforms or parisons characterised by their configuration characterised by the shape characterised by the shape of specific parts of preform characterised by the neck
    • B29C2949/0777Tamper-evident band retaining ring
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3024Preforms or parisons made of several components characterised by the number of components or by the manufacturing technique
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3032Preforms or parisons made of several components having components being injected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06Injection blow-moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/071Preforms or parisons characterised by their configuration, e.g. geometry, dimensions or physical properties
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6427Cooling of preforms
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6436Thermal conditioning of preforms characterised by temperature differential
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6463Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6464Heating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6463Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6465Cooling
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6409Thermal conditioning of preforms
    • B29C49/6463Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms
    • B29C49/6466Thermal conditioning of preforms by contact heating or cooling, e.g. mandrels or cores specially adapted for heating or cooling preforms on the inside
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2067/00Use of polyesters or derivatives thereof, as moulding material
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2105/00Condition, form or state of moulded material or of the material to be shaped
    • B29K2105/25Solid
    • B29K2105/253Preform

Definitions

  • the present invention relates to a receiving system for the aftertreatment of a hollow body molded article produced in an injection mold and to a corresponding method.
  • Moldings or preforms made of plastics are produced in large numbers in injection molding. Of particular importance is the production of hollow body moldings, so-called preforms, made of PET as a basis for the production of PET beverage bottles.
  • the hollow body moldings are, after the injection molding process is completed, inflated to the desired final size at the same or a different location by blow molding.
  • injection molding machines are used with tools having a large number of mold cavities, for example 48. Therefore, z.
  • up to 192 moldings can be produced simultaneously in parallel during a single injection molding cycle. Since the number of mold cavities is limited due to the limited physical dimensions of the dies of injection molding machines, to increase the number of moldings produced in a time interval, the cycle time, i. the time required to make a molded product in a mold nest can be shortened. In the process, the moldings are removed earlier from the injection mold within the injection molding cycle in order to be able to use the mold for the next injection.
  • the moldings have not yet cooled sufficiently far at earlier withdrawal times that they can be removed without the risk of deformations.
  • the moldings are externally cooled to the extent that they have a stable outer contour, but the plastic material inside the moldings is still liquid. If the heat removal is interrupted away from the surface of the moldings, then the plastic material on the surface of the moldings liquefies again due to the heat transport from the interior of the moldings to the surface. Therefore, care must be taken in the removal and in the immediately subsequent phase that the moldings undergo no deformation and the moldings are cooled after removal from the mold cavity on.
  • the preform mold cavities generally consist of at least three parts: a cavity which forms the outer mold for the preform belly, a neck mold which is made in two pieces and, when closed, the mold for the neck, i. usually for the thread as well as the support ring and sealing ring of the bottle, forms and a core, which defines the inner surface of the molding.
  • the molding together with the core is withdrawn from the cavity, wherein the neck mold is closed, so that it holds the molding on the core.
  • a removal plate with a withdrawal sleeve or cavity is brought into the region under the molding, wherein in a further step, the neck shoe, i. the shape of the neck of the bottle is opened by lateral movement of the two halves, so that the molding can slip off the core of the mold and fall into the withdrawal cavity or be moved into the withdrawal cavity by means of a compressed air pulse.
  • the removal plate After the removal plate has been removed from the clamping unit, the tool is available for the next injection molding process. If the tool has several mold cavities, a corresponding number of removal cavities are provided in the removal plate.
  • the mold cavities also extend in a substantially vertical direction, so that gravity can be used to pull off the moldings from the cores.
  • there are also horizontal systems whose closing units close in the horizontal direction.
  • the mold cavities also extend substantially horizontally in this case. Therefore, in horizontal systems, the removal of the moldings from the core is often done with the aid of additional forces, e.g. by compressed air or by a mechanical gripper.
  • a post-treatment of the molding takes place, ie it is cooled down until it has reached its complete stability and a glassy, ie transparent and clear, structure of the molding can be ensured.
  • the cooling capacity is transferred only to a limited extent to the moldings, since due to the shrinkage of the PET material during cooling only a poor contact between the sampling cavity and the molding is present.
  • the neck portion of the hollow body blank can not be cooled in thermal contact with the cavity due to undercuts by the thread and the neck ring, but only by a complex air shower, i. by passing a stream of air on the outside of the neck of the molding.
  • the present invention has the object to provide a receiving system for the aftertreatment of a molded article produced in an injection mold, which avoids the aforementioned disadvantages and faster cooling of the molding, but in particular the neck region of the molding allows.
  • the outer diameter of the receiving finger is substantially equal to the inner diameter of the molded article to be removed in the cooled state. In this way, the receiving finger affects the shrinkage of the material during cooling only slightly, and the molding can be removed after cooling with relatively little force from the receiving finger.
  • the outer diameter of the finger is 0.1 mm to 0.5 mm smaller than the inner diameter of the molding to be removed in the removal state.
  • the removal state the state in which the hollow body molding is removed from the cavity and transferred to the system for aftertreatment. In this state, the molding is still hot at least in its interior and the material shrinks on cooling.
  • the receiving system according to the invention is preferably set up for receiving the hollow body molding outside the closing unit of the injection molding machine, wherein the hollow body molding is transferred from a removal plate to the receiving system.
  • the receiving system may be configured such that it is set up as a removal plate for the removal of the moldings from the tool in the interior of the clamping unit.
  • This embodiment of the receiving system with a receiving finger when demolding allows first to leave the molding in the cavity of the mold cavity, the neck jaws remain closed while the mold core is pulled out of the molding. Subsequently, either the neck cheeks are opened, so that the molding can fall out of the mold cavity on the receiving finger or the receiving finger is inserted into the molding, the neck jaws open and subsequently removed the molding on the receiving finger from the cavity of the mold cavity.
  • the molding Due to shrinkage of the plastic material upon cooling of the molding, the molding is shrunk onto the receiving finger, thereby maintaining good thermal contact between the receiving finger and the inner wall of the molding.
  • This contact is particularly also in the neck region of the molding, i. present in the area in which the neck ring and the thread of the bottle are arranged.
  • a faster cooling of the molding and especially in the neck region of the molding achieved as in the sampling systems of the prior art.
  • an additional air shower in the neck region of the molded article can be dispensed with.
  • the receiving finger has a cooling device.
  • a device for heating the molded article is provided. In this way, the molding can be reheated after reaching its dimensionally stable state and then the next production step, ie the blow molding, fed.
  • the molding is preferably heated in defined sections, for example the bottle belly, while other areas, for example the bottleneck, which are no longer allowed to deform during further processing, are cooled. If, in this process, the molded article is cooled below a certain critical temperature before re-heating, the bottles produced in this way show increased stability.
  • the means for cooling and / or heating is a flow channel for a fluid, which is connectable to a device for generating a fluid flow.
  • a flow channel can optionally be traversed by a heated or a cooled fluid, so that this channel is used both for heating and for cooling the molding.
  • the device for heating may be an electric heater and / or an infrared lighting, which are integrated in the receiving finger. It is also possible to cool the finger with the help of a piezocooling.
  • the receiving system has, in addition to the receiving finger, an after-treatment sleeve which is movable relative to the receiving pin so as to surround the receiving finger and the hollow body molding arranged thereon. It is expedient if the post-processing sleeve is formed as a cavity whose inner wall corresponds approximately to the outer shape of the hollow body molding.
  • the receiving finger has a holding device for the molding.
  • such a holding device has at least one opening in the receiving finger, which can be connected to a vacuum device.
  • the molding can be sucked and held by the receiving finger.
  • the system moreover has a spacing device which is designed such that the majority of the inner surface of the molding does not come into contact with the outer surface of the receiving finger.
  • the spacer means comprises at least one opening in the receiving finger, which is connectable to a fluid supply.
  • the molding With the aid of a continuous fluid flow, the molding is held on an air cushion at a defined distance from the receiving finger.
  • This non-contact mounting of the molding on the Pick-up finger minimizes the deformations experienced by the molding during removal from the mold cavity and / or during the cooling process. It is expedient if the spacer device between the inner surface of the molding and the outer surface of the receiving finger ensures a distance of about 0.5 mm and up to about 10 mm, preferably from 1 mm to 5 mm.
  • the spacer device is formed by an opening in the receiving finger, which can be connected to a fluid supply, then it is expedient for the receiving system to have a device for heating and / or cooling the fluid flow.
  • the cooling or heating of the molding may serve directly through the fluid stream used to hold the molding.
  • An embodiment of the invention is preferred in which the at least one opening, which is connectable to a vacuum device (as a holding device) and / or a fluid supply (as a spacer device), is arranged in the vicinity of the first end of the finger.
  • the receiving finger is at least partially made of a porous material which forms the at least one opening.
  • the porous material which forms the at least one opening.
  • the receiving finger has a stop for the hollow body molding, so that the open end of the hollow body molding is supported on this. In this way it is prevented that the hollow body molding expands beyond a desired extent due to the gravity acting on it on the receiving finger.
  • the stop is adjustable. This can be adjusted as far as the receiving finger penetrates into the hollow body molding. This is particularly advantageous in the embodiment in which it is provided that the hollow body molding after cooling occurs as flat as possible with the receiving finger in contact. If it turns out during operation that the hollow body moldings sit after their cooling too tight on the receiving finger and therefore difficult to remove, the stop can be adjusted so that the receiving finger is not so far immersed in the hollow body molding. Will now the outer contour of the receiving finger or the inner contour of the hollow body molding slightly conical, this leads to the fact that the distance between the "hot" hollow body molding and Aufnähmefinger can be adjusted by the adjustment of the stop.
  • the stop is designed as a support ring or plate which annularly surround the receiving finger in the vicinity of the second end of the receiving finger. In this way, the open end of the hollow body molding can be fully supported.
  • the receiving finger has an ejection device, which makes it possible to strip the cooled hollow body molding of the receiving finger.
  • Such ejection device is formed by an opening in the receiving finger, which is acted upon by a fluid flow, so that the hollow body molding can be stripped by a fluid pulse from the receiving finger.
  • the ejection means may comprise means which surrounds the receiving finger in the vicinity of its lower end and which is axially movable along the finger. In this movement, the mouth region of the hollow body molding or the edge region of the neck ring is detected and stripped of the molding.
  • the ejection device is formed from the support ring or the plate of the stop.
  • FIG. 1 shows schematically the recording system according to the invention for the aftertreatment of a plurality of hollow body moldings produced in an injection mold, wherein the description of the figure shows in particular the functions of the receiving system within the manufacturing process.
  • the hollow body moldings 1 produced in an injection mold of an injection molding machine are removed with the aid of a removal plate 2 from the mold cavities of the injection mold.
  • the hollow body moldings 1 are so-called preforms or preforms for the production of PET bottles.
  • the preforms 1 are removed by means of removal cavities 3 of the removal plate 2 from the mold cavities of the injection mold.
  • the removal plate 2 can be moved into the closing unit of the injection molding machine.
  • the preforms 1 are transferred from the removal plate 2 to the receiving system 4 according to the invention.
  • the receiving system 4 receiving finger 5, which engage as a core in the interior of the preforms 1 and hold the preforms 1.
  • the illustrated embodiment of the receiving system 4 has four sets 6 to 9 of receiving fingers 5, which are arranged on a rotatably mounted cube 10.
  • a respective set of receiving fingers 6 to 9 is arranged on one of the side surfaces of the cube 10.
  • the receiving finger set 6 is in the transfer position, in which the receiving fingers 5 receive the preforms 1 from the removal plate 2.
  • either the receiving system 4 or the removal plate 2 is moved so that the receiving fingers protrude into the interior of the preforms 1, hold them and take out of the removal cavities 3 by appropriate method of the receiving system 4 or the removal plate 2.
  • the cube 10 of the removal system 4 is rotated so that the next free set 9 of recording fingers 5 is rotated to the recording position, while the preforms with 1 set 6 now in the position of the sentence 7 of the representation in FIG. 1 is turned.
  • the recorded from the receiving fingers 5 of the set 6 preforms 1 can cool.
  • the preforms are in the stripping position, in which FIG. 1 the set 8 of the receiving finger 5 is rotated.
  • the preforms 1 are stripped off the receiving fingers 5 and can be removed for further processing, for example with a conveyor belt 11.
  • the illustrated schematic view shows a recording system with four sets of 16 recording fingers 5, which are arranged in a 4 x 12 matrix on the side surfaces of the cube 10 of the recording system 4.
  • Other arrangements of the receiving fingers are possible, the number and arrangement of the fingers corresponding to the number and arrangement of the removal cavities of the removal plate.
  • FIGS. 4 and 5 an alternative embodiment of the receiving system 4 'according to the invention for the aftertreatment of the moldings 1 is shown.
  • the illustrations in FIGS. 4 and 5 show next to the receiving system 4 'and the closing unit 23 of the injection molding machine and the removal plate 2' of the system.
  • FIG. 4 is the vertical closing unit 23 of the injection molding machine shown in the extended state.
  • the removal plate 2 ' has been introduced into the closing unit 23, so that the receiving cavities 3 of the removal plate 2' are arranged below the cores 25 of the mold .
  • the removal from the cores can also be done pneumatically, by means of a stripper plate or by means of a gripper connected to the removal plate.
  • three-stage cooling plate has cooling fingers 5, which are arranged at a distance from each other, which is equal to one third of the distance between the receiving cavities 3 of the removal plate 2 '.
  • each finger 5 has a separately controllable scraper ring 18, so that the moldings 1 can be selectively ejected on the fingers 5.
  • the receiving system 4 can operate in three stages, wherein while a first set of moldings 1 is cooled, on the same plate 27, a second set of moldings is added, while shortly thereafter, a third, already cooled set of moldings 1 on a Conveyor belt 11 is ejected.
  • FIG. 6 a further embodiment of the receiving system 4 "according to the invention for cooling the moldings 1 is shown together with the closing unit 23.
  • the receiving system consists of several, in the embodiment shown, three aftercooling plates 28 which are successively equipped with hollow body moldings with the aid of the removal plate 2 '
  • the aftercooling plates 28 are provided in a racking arrangement which allows one set of moldings 1 to be cooled while one set of moldings 1 is being transferred from the unloading plate while another set of moldings 1 is being ejected.
  • FIGS. 8 to 9 While all embodiments of the receiving system 4, 4 ', 4 "shown so far” provide a removal plate 2, 2' in order to remove the shaped articles 1 from the tool in the closing unit 3 and to transfer them to the receiving fingers, the drawing in FIGS. 8 to 9 illustrated, alternative embodiment no such removal plate.
  • the function of the removal plate is taken over by the Nachkühlplatten 28 '.
  • the aftercooling plates 28 ' are movable as in the closing unit and take there directly the moldings 1 from the cavities 24' of the mold.
  • FIG. 7 While in FIG. 7 the closing unit 23 of the injection molding apparatus is still shown closed and straight moldings 1 are ejected from one of the aftercooling plate 28 ' FIG. 8 the closing unit 23 in the open state. In this case, one of the aftercooling plates 28 'was moved into the closing unit. From this figure it is clear that if it is to be held to fill the mold nests from their closed end, this type of removal requires a departure from the previous principles of mold design. After opening the closing unit 23, the closed neck jaws 26 'remain in the cavities 24' of the mold cavities, so that the moldings 1 remain in the cavities 24 ', while the cores 25' are pulled out of the moldings 1.
  • the moldings, 1 can be taken up by the aftercooling plate 28'.
  • the fingers 5 of the plate 28 ' inserted into the cavities 24' of the mold stuck hollow body moldings 1.
  • Die beiden Blende 1 und 5 Sindtechnik die in Fig. 2 treats.
  • the moldings are gripped for example by means of a vacuum of the fingers 5, removed from the cavities 24 'and cooled outside the clamping unit 23 on the same fingers 5.
  • FIG. 2 shows a side sectional view of a receiving finger 5, and by way of example its attachment to a Nachkühlplatte 28 of the receiving system 4.
  • An identical finger can also be used for all other embodiments of Nachkühlplatten or cubes.
  • the core 12 of the receiving finger 5 has an outer surface 13 which substantially corresponds to the shape of the inner surface 14 of the preforms 1.
  • a vacuum system is provided in the illustrated embodiment. Via the inside of the core 12 provided channel 15, which has an opening in the outer surface 13 of the core 12 in the region of the tip 16 of the core 12, a negative pressure is applied. This negative pressure sucks the bottom of the preform 1, so that the preform is held on the core 12. This negative pressure can in the transfer position of the set 6 of the receiving finger 5 off FIG. 1 also be used to remove the preforms from the removal plate 2.
  • the channel 15 is connected via a connection 17 optionally with a vacuum device for generating a negative pressure, as described above, or with a pressure device connectable. For stripping the preform 1 from the core 12 in the position of the set 8 FIG. 1 the channel 15 is subjected to a slight overpressure, so that the preform 1 is repelled by the core 12.
  • a movable support ring 18 is provided, which surrounds the core 12 of the finger 5 and on the itself the neck 19 of the preform 1 is supported.
  • the support ring 18 can be moved along the core 12 of the finger 5, so that a force is exerted on the neck 19 of the preform 1 in the stripping direction.
  • the support ring 18 also serves as a stop for the edge of the bottle neck. With the help of the support ring is determined how far the core 12 of the finger engages in the molding 1. Since both the inner surface of the preform 14 and the outer surface 15 of the finger define conical bodies, the penetration depth of the core 12 into the molding 1 significantly determines the extraction forces required after cooling and therefore after shrinking of the molding 1 drop the blank 1 from the core 12 of the finger.
  • FIG. 2 shown core 12 has a Wasser malflußksselung, wherein around the vacuum or compressed air channel 15 in the center of the core 12 concentrically around an inlet and outlet 20, 21 is provided.
  • the radial arrangement of the channels 15, 20, 21 is clearly in a horizontal sectional view of the receiving finger 5 in FIG. 3 to see.
  • the circumference of the outer surface 13 is in the illustrated embodiment at all points along the longitudinal axis of the core 12 by about 0.1 mm smaller than the inner diameter of the preform 1 in the hot state in which the preform 1 removed from the mold cavity of the tool and to the Cold finger is passed. In this way, even after the shrinkage of the material of the preform 1 during cooling, the stripping forces between the inner surface 14 of the preform and the outer surface 13 of the core 12 are so small that the preform 1 with the aid of compressed air through the channel 15 and the scraper ring 18th can be removed from the finger.
  • FIG. 2 schematically illustrated support ring 18 may, if appropriate, as in FIG. 1 represented by a stripper plate, which has holes in the region of the individual fingers 5, to be replaced. In this way, by a single movement of the plate, all the preforms on the fingers 5 of a set of fingers can be scraped off at once.
  • the core 12 of the receiving finger 5 consists in the illustrated embodiment of a one-piece hollow body.
  • the hollow body is inserted into a recess 31 of the aftercooling plate 28 and secured by means of a clamping ring 31 which is screwed to the Nachkühlplatte 28, to the aftercooling plate.
  • the hollow body is sealed by means of an O-ring 30 against the Nachkühlplatte 28, so that the cooling fluid can not escape from the Nachkühlplatte 28 or the finger 5.
  • the channels 15, 20, 21 in the interior of the core 12 are formed by concentrically arranged tubes 33, 34.
  • the radially outer tube 33 is arranged such that its outer wall has a distance from the core 12, so that the return passage 21 is formed for the cooling fluid.
  • the radially inner tube in turn has a distance from the radially outer tube 33, so that the feed channel 20 is formed for the cooling fluid.
  • the plate-side ends of the tubes 33, 34 are such fitted in the aftercooling plate 28, that the inlet channel 20 and the return channel 21 with the inlet channel 35 and the outlet channel 36 of the Nachkühlplatte are in communication.
  • the tubes 33, 34 are soldered at their ends lying in the region of the tip 16 of the core 12 with a centering plate 37.
  • the centering plate 37 is sealed by means of an O-ring 38 against the core 12.
  • the radially outer tube 33 terminates at the centering plate 37, wherein it has perforation holes 40 in this area, which produce connections distributed over the circumference between the inlet channel 15 and the return channel 21.
  • the radially inner tube 34 engages both through the centering plate 37 and through the tip 16 of the core 12 so that it forms a connection of the channel 15 with the outer surface 13 of the core 12.
  • the end of the tube 34 is soldered to the tip 16.
  • the plate-side end of the tube engages in the compressed air or vacuum channel connection 17 of the aftercooling plate 28.
  • the end of the tube 34 is sealed by means of an O-ring 39 against the Nachkühlplatte 28, so that the cooling fluid can not penetrate into the channel 15.
  • swirling means may be provided which provide turbulent flow within the return passage 21 to provide better cooling performance.
  • the turbulators may be ribs, for example.

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  • Moulds For Moulding Plastics Or The Like (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)

Description

Die vorliegende Erfindung betrifft ein Aufnahmesystem zur Nachbehandlung eines in einer Spritzgießform hergestellten Hohlkörperformlings sowie ein entsprechendes Verfahren.The present invention relates to a receiving system for the aftertreatment of a hollow body molded article produced in an injection mold and to a corresponding method.

Formlinge bzw. Vorformlinge aus Kunststoffen werden in großer Zahl in Spritzgießtechnik hergestellt. Besondere Bedeutung hat die Herstellung von Hohlkörperformlingen, sogenannten Preforms, aus PET als Grundlage für die Produktion von PET-Getränkeflaschen. Die Hohlkörperformlinge werden, nachdem der Spritzgießprozeß abgeschlossen ist, am gleichen oder einem anderen Ort durch Blasformen auf das gewünschte Endmaß aufgeblasen.Moldings or preforms made of plastics are produced in large numbers in injection molding. Of particular importance is the production of hollow body moldings, so-called preforms, made of PET as a basis for the production of PET beverage bottles. The hollow body moldings are, after the injection molding process is completed, inflated to the desired final size at the same or a different location by blow molding.

Für das Spritzgießen der Hohlkörperformlinge werden Spritzgießmaschinen mit Werkzeugen verwendet, die eine große Anzahl von Formnestern, zum Beispiel 48, aufweisen. Daher können z. Zt. während eines einzigen Spritzgießzyklus zeitlich parallel bis zu 192 Formlinge hergestellt werden. Da der Anzahl der Formnester aufgrund der begrenzten räumlichen Abmessungen der Schließeinheiten von Spritzgießmaschinen eine Grenze gesetzt ist, muß für eine Erhöhung der Anzahl der in einem Zeitintervall herstellbaren Formlinge, die Zykluszeit, d.h. die Zeit, die benötigt wird, um in einem Formnest einen Formling herzustellen, verkürzt werden. Dabei geht man dazu über, die Formlinge innerhalb des Spritzgießzyklus immer früher aus der Spritzgießform zu entnehmen, um die Form für die nächste Injektion verwenden zu können. Trotz der Kühlung der einzelnen Formnester sind zu früheren Entnahmezeitpunkten die Formlinge noch nicht so weit abgekühlt, daß sie ohne die Gefahr von Deformationen entnommen werden können. Zwar sind die Formlinge äußerlich soweit abgekühlt, daß sie eine stabile Außenkontur aufweisen, jedoch ist das Kunststoffmaterial im Inneren der Formlinge nach wie vor flüssig. Wird die Wärmeabfuhr von der Oberfläche der Formlinge weg unterbrochen, so verflüssigt sich auch das Kunststoffmaterial an der Oberfläche der Formlinge wieder aufgrund des Wärmetransports aus dem Inneren der Formlinge an die Oberfläche. Daher muß bei der Entnahme und in der unmittelbar daran anschließenden Phase dafür Sorge getragen werden, daß die Formlinge keinerlei Deformation erfahren und die Formlinge im Anschluß an die Entnahme aus den Formnester weiter gekühlt werden.For the injection molding of the hollow body moldings, injection molding machines are used with tools having a large number of mold cavities, for example 48. Therefore, z. At present, up to 192 moldings can be produced simultaneously in parallel during a single injection molding cycle. Since the number of mold cavities is limited due to the limited physical dimensions of the dies of injection molding machines, to increase the number of moldings produced in a time interval, the cycle time, i. the time required to make a molded product in a mold nest can be shortened. In the process, the moldings are removed earlier from the injection mold within the injection molding cycle in order to be able to use the mold for the next injection. Despite the cooling of the individual mold cavities, the moldings have not yet cooled sufficiently far at earlier withdrawal times that they can be removed without the risk of deformations. Although the moldings are externally cooled to the extent that they have a stable outer contour, but the plastic material inside the moldings is still liquid. If the heat removal is interrupted away from the surface of the moldings, then the plastic material on the surface of the moldings liquefies again due to the heat transport from the interior of the moldings to the surface. Therefore, care must be taken in the removal and in the immediately subsequent phase that the moldings undergo no deformation and the moldings are cooled after removal from the mold cavity on.

Die weitere Kühlung und damit die vollständige Aushärtung der Formlinge erfolgt dann außerhalb der eigentlichen Formnester und außerhalb der Schließeinheit, so daß diese für den nächsten Spritzgießvorgang zur Verfügung stehen.The further cooling and thus the complete curing of the moldings is then outside the actual mold cavities and outside the clamping unit, so that they are available for the next injection molding.

Die aus dem Stand der Technik bekannten Werkzeuge für Vorformlinge zur Herstellung von Flaschen sind derart angeordnet, daß die Formnester vom geschlossenen Ende der Formlinge befüllt werden. Auf diese Weise liegt der Anguß der Flaschen zum einen in dem für den Endkunden nicht unmittelbar einsehbaren Bodenbereich der Flasche, zum anderen ist das gegenüberliegende Ende des Vorformlings, d.h. der Flaschenhals mit dem Gewinde, extrem kritisch in Bezug auf die Maßhaltigkeit, da nach dem Spritzgießen an diesem Ende keine weitere Nachbearbeitung erfolgt.The known from the prior art tools for preforms for the production of bottles are arranged such that the mold cavities are filled by the closed end of the moldings. In this way, the sprue of the bottles is on the one hand in the bottom area of the bottle not directly visible to the end customer, on the other hand, the opposite end of the preform, i. the bottleneck with the thread, extremely critical in terms of dimensional stability, since after the injection molding at this end no further post-processing takes place.

Die einzelnen Formnester für die Vorformlinge bestehen aus im allgemeinen mindestens drei Teilen: einer Kavität, welche die äußere Form für den Bauch des Vorformlings bildet, einer Halsbacke, welche zweistückig ausgeführt ist und im geschlossenen Zustand die Form für den Hals, d.h. in der Regel für das Gewinde sowie den Tragring und Dichtring der Flasche, bildet und einem Kern, welcher die innere Oberfläche des Formlings definiert.The preform mold cavities generally consist of at least three parts: a cavity which forms the outer mold for the preform belly, a neck mold which is made in two pieces and, when closed, the mold for the neck, i. usually for the thread as well as the support ring and sealing ring of the bottle, forms and a core, which defines the inner surface of the molding.

Um den fertigen Hohlkörperformling aus dem Formnest zu entnehmen, wird üblicherweise der Formling samt Kern aus der Kavität abgezogen, wobei die Halsbacke geschlossen ist, so daß sie den Formling auf dem Kern hält. Nachfolgend wird eine Entnahmeplatte mit einer Entnahmehülse bzw. - kavität in den Bereich unter den Formling gebracht, wobei in einem weiteren Schritt die Halsbacke, d.h. die Form des Flaschenhalses, durch seitliches Auffahren der beiden Hälften geöffnet wird, so daß der Formling vom Kern der Form abrutschen kann und in die Entnahmekavität fällt bzw. mit Hilfe eines Druckluftimpulses in die Entnahmekavität hineinbewegt wird. Nachdem die Entnahmeplatte aus der Schließeinheit entfernt wurde, steht das Werkzeug für den nächsten Spritzgießvorgang zur Verfügung. Weist das Werkzeug mehrere Formnester auf, so ist in der Entnahmeplatte eine entsprechende Anzahl von Entnahmekavitäten vorgesehen.In order to remove the finished hollow body molding from the mold cavity, usually the molding together with the core is withdrawn from the cavity, wherein the neck mold is closed, so that it holds the molding on the core. Subsequently, a removal plate with a withdrawal sleeve or cavity is brought into the region under the molding, wherein in a further step, the neck shoe, i. the shape of the neck of the bottle is opened by lateral movement of the two halves, so that the molding can slip off the core of the mold and fall into the withdrawal cavity or be moved into the withdrawal cavity by means of a compressed air pulse. After the removal plate has been removed from the clamping unit, the tool is available for the next injection molding process. If the tool has several mold cavities, a corresponding number of removal cavities are provided in the removal plate.

Die vorangegangenen Beschreibung bezieht sich auf ein sogenanntes vertikales System, in welchem sich die Schließeinheit in vertikaler Richtung schließt. Daher erstrecken sich auch die Formnester im wesentlichen in vertikaler Richtung, so daß die Schwerkraft zum Abziehen der Formlinge von den Kernen genutzt werden kann. Alternativ dazu gibt es auch horizontale Systeme, deren Schließeinheiten in horizontaler Richtung schließen. Die Formnester erstrecken sich in diesem Fall ebenfalls im wesentlichen horizontal. Daher erfolgt in horizontalen Systemen das Abziehen der Formlinge vom Kern häufig mit Hilfe von zusätzlichen Kräften, z.B. durch Druckluft oder durch einen mechanischen Greifer.The foregoing description refers to a so-called vertical system in which the closing unit closes in the vertical direction. Therefore, the mold cavities also extend in a substantially vertical direction, so that gravity can be used to pull off the moldings from the cores. Alternatively, there are also horizontal systems whose closing units close in the horizontal direction. The mold cavities also extend substantially horizontally in this case. Therefore, in horizontal systems, the removal of the moldings from the core is often done with the aid of additional forces, e.g. by compressed air or by a mechanical gripper.

In der Entnahmekavität findet eine Nachbehandlung des Formlings statt, d.h. er wird hier so lange abgekühlt, bis er seine vollständige Stabilität erreicht hat und eine glasartige, d.h. durchsichtige und klare, Struktur des Formlings gewährleistet werden kann.In the sampling cavity, a post-treatment of the molding takes place, ie it is cooled down until it has reached its complete stability and a glassy, ie transparent and clear, structure of the molding can be ensured.

Aus dem Stand der Technik, insbesondere der US 6,475,422 B1 , sind ferner Entnahmesysteme bekannt, bei denen zusätzlich zur Kühlung der Entnahmekavität ein Kühlfinger in das Innere des Formlings eingeführt wird, welcher den Formling von seiner Innenseite her mit Hilfe eines Luftstroms kühlt: Dabei wird eine Berührung der Innenseite des Formlings vermieden, um keine weiteren Quellen für Deformationen zu schaffen.From the prior art, in particular the US Pat. No. 6,475,422 B1 Furthermore, removal systems are known in which in addition to the cooling of the withdrawal cavity, a cold finger is inserted into the interior of the molding, which cools the molding from its inside by means of an air flow: In this case, a touch of the inside of the molding is avoided to no further sources to create for deformations.

Solche Entnahmesysteme sind auch bekannt aus der WO 99/50039 , der WO 99/58313 sowie der WO 20041041510 . Das Dokument WO 99/58313 offenbart ein System nach dem Oberbegriff des Anspruchs 1.Such removal systems are also known from the WO 99/50039 , of the WO 99/58313 as well as the WO 20041041510 , The document WO 99/58313 discloses a system according to the preamble of claim 1.

Bei den aus dem Stand der Technik bekannten Entnahmesystemen wird die Kühlleistung nur in begrenztem Maß auf die Formlinge übertragen, da aufgrund der Schwindung des PET-Materials beim Abkühlen nur ein mangelhafter Kontakt zwischen der Entnahmekavität und dem Formling vorhanden ist.In the removal systems known from the prior art, the cooling capacity is transferred only to a limited extent to the moldings, since due to the shrinkage of the PET material during cooling only a poor contact between the sampling cavity and the molding is present.

Darüber hinaus kann der Halsbereich des Hohlkörperformlings aufgrund von Hinterschneidungen durch das Gewinde und den Halsring nicht im thermischen Kontakt mit der Kavität gekühlt werden, sondern lediglich durch eine aufwendige Luftdusche, d.h. durch das Vorbeiführen eines Luftstroms an der Außenseite des Halses des Formlings.Moreover, the neck portion of the hollow body blank can not be cooled in thermal contact with the cavity due to undercuts by the thread and the neck ring, but only by a complex air shower, i. by passing a stream of air on the outside of the neck of the molding.

Dem gegenüber liegt der vorliegenden Erfindung die Aufgabe zugrunde, ein Aufnahmesystem zur Nachbehandlung eines in einer Spritzgießform hergestellten Formlings bereitzustellen, welches die zuvor genannten Nachteile vermeidet und eine schnellere Abkühlung des Formlings, insbesondere aber des Halsbereichs des Formlings, ermöglicht.In contrast, the present invention has the object to provide a receiving system for the aftertreatment of a molded article produced in an injection mold, which avoids the aforementioned disadvantages and faster cooling of the molding, but in particular the neck region of the molding allows.

Diese Aufgabe wird erfindungsgemäß durch ein System mit den Merkmalen von Anspruch 1 gelöst.This object is achieved by a system having the features of claim 1.

Auf diese Weise kann ein optimaler thermischer Kontakt zwischen dem Aufnahmefinger und der Innenwand des Formlings in allen Bereichen des Formlings erreicht werden.In this way, an optimal thermal contact between the receiving finger and the inner wall of the molding in all areas of the molding can be achieved.

Dabei ist es weiterhin vorgesehen, daß der Außendurchmesser des Aufnahmefingers im wesentlichen gleich dem Innendurchmesser des zu entnehmenden Formlings im abgekühlten Zustand ist. Auf diese Weise beeinflußt der Aufnahmefinger die Schwindung des Materials beim Abkühlen nur geringfügig, und der Formling läßt sich nach dem Abkühlen mit verhältnismäßig geringer Kraft vom Aufnahmefinger abnehmen.It is further provided that the outer diameter of the receiving finger is substantially equal to the inner diameter of the molded article to be removed in the cooled state. In this way, the receiving finger affects the shrinkage of the material during cooling only slightly, and the molding can be removed after cooling with relatively little force from the receiving finger.

Um die Entnahmekräfte beim Abnehmen des Formlings von dem Aufnahmefinger so gering wie möglich zu halten, ist es vorgesehen, dass der Außendurchmesser des Fingers en 0,1 mm bis 0,5 mm kleiner ist als der Innendurchmesser des zu entnehmenden Formlings im Entnahmezustand. Dabei wird als Entnahmezustand der Zustand bezeichnet, in welchem der Hohlkörperformling aus der Kavität entnommen und an das System zur Nachbehandlung übergeben wird. In diesem Zustand ist der Formling zumindest in seinem Inneren noch heiß und das Material schwindet beim Abkühlen.In order to keep the withdrawal forces as small as possible when removing the molding from the receiving finger, it is provided that the outer diameter of the finger is 0.1 mm to 0.5 mm smaller than the inner diameter of the molding to be removed in the removal state. In this case, the state in which the hollow body molding is removed from the cavity and transferred to the system for aftertreatment is referred to as the removal state. In this state, the molding is still hot at least in its interior and the material shrinks on cooling.

Das erfindungsgemäße Aufnahmesystem ist vorzugsweise zur Aufnahme des Hohlkörperformlings außerhalb der Schließeinheit der Spritzgießmaschine eingerichtet, wobei der Hohlkörperformling von einer Entnahmeplatte an das Aufnahmesystem übergeben wird.The receiving system according to the invention is preferably set up for receiving the hollow body molding outside the closing unit of the injection molding machine, wherein the hollow body molding is transferred from a removal plate to the receiving system.

Alternativ dazu kann das Aufnahmesystem derart ausgestaltet sein, daß es als Entnahmeplatte für die Entnahme der Formlinge aus dem Werkzeug im Inneren der Schließeinheit eingerichtet ist. Diese Ausführungsform des Aufnahmesystems mit einem Aufnahmefinger ermöglicht es beim Entformen zunächst den Formling in der Kavität des Formnests zu belassen, wobei die Halsbacken geschlossen bleiben, während der Formkern aus dem Formling herausgezogen wird. Nachfolgend werden entweder die Halsbacken geöffnet, so daß der Formling aus der Formkavität auf den Aufnahmefinger fallen kann oder der Aufnahmefinger wird in den Formling eingeführt, die Halsbacken geöffnet und nachfolgend der Formling auf dem Aufnahmefinger aus der Kavität des Formnests entnommen. 'Alternatively, the receiving system may be configured such that it is set up as a removal plate for the removal of the moldings from the tool in the interior of the clamping unit. This embodiment of the receiving system with a receiving finger when demolding allows first to leave the molding in the cavity of the mold cavity, the neck jaws remain closed while the mold core is pulled out of the molding. Subsequently, either the neck cheeks are opened, so that the molding can fall out of the mold cavity on the receiving finger or the receiving finger is inserted into the molding, the neck jaws open and subsequently removed the molding on the receiving finger from the cavity of the mold cavity. '

Aufgrund der Schwindung des Kunststoffmaterials beim Abkühlen des Formlings wird der Formling auf den Aufnahmefinger aufgeschrumpft, wodurch ein guter thermischer Kontakt zwischen dem Aufnahmefinger und der Innenwand des Formlings aufrechterhalten wird.Due to shrinkage of the plastic material upon cooling of the molding, the molding is shrunk onto the receiving finger, thereby maintaining good thermal contact between the receiving finger and the inner wall of the molding.

Dieser Kontakt ist insbesondere auch im Halsbereich des Formlings, d.h. in dem Bereich vorhanden, in dem der Halsring sowie das Gewinde der Flasche angeordnet sind. Auf diese Weise wird in dem erfindungsgemäßen Aufnahmesystem eine schnellere Abkühlung des Formlings auch und vor allem im Halsbereich des Formlings erreicht als in den Entnahmesystemen aus dem Stand der Technik. Auf eine zusätzliche Luftdusche im Halsbereich des Formlings kann je nach Ausführungsform der Erfindung verzichtet werden.This contact is particularly also in the neck region of the molding, i. present in the area in which the neck ring and the thread of the bottle are arranged. In this way, in the receiving system according to the invention a faster cooling of the molding and especially in the neck region of the molding achieved as in the sampling systems of the prior art. Depending on the embodiment of the invention, an additional air shower in the neck region of the molded article can be dispensed with.

Zum Abkühlen des Formlings ist es vorteilhaft, wenn der Aufnahmefinger eine Kühleinrichtung aufweist. Darüber hinaus kann es jedoch zweckmäßig sein, wenn alternativ oder zusätzlich eine Einrichtung zum Heizen des Formlings vorgesehen ist. Auf diese Weise kann der Formling nach dem Erreichen seines formstabilen Zustands wieder erwärmt und dann dem nächsten Produktionsschritt, d.h. dem Blasformen, zugeführt werden.For cooling the molded article, it is advantageous if the receiving finger has a cooling device. In addition, however, it may be expedient if, alternatively or additionally, a device for heating the molded article is provided. In this way, the molding can be reheated after reaching its dimensionally stable state and then the next production step, ie the blow molding, fed.

Dabei ist es zweckmäßig, wenn die Erwärmung des Formlings vorzugsweise in definierten Abschnitten, beispielsweise dem Flaschenbauch, erfolgt, während andere Bereiche, beispielsweise der Flaschenhals, die sich während der weiteren Verarbeitung nicht mehr verformen dürfen, gekühlt werden. Wird bei diesem Prozeß der Formling vor dem erneuten Aufheizen unter eine bestimmte kritische Temperatur gekühlt, so zeigen die auf diese Weise hergestellten Flaschen eine erhöhte Stabilität.It is expedient if the molding is preferably heated in defined sections, for example the bottle belly, while other areas, for example the bottleneck, which are no longer allowed to deform during further processing, are cooled. If, in this process, the molded article is cooled below a certain critical temperature before re-heating, the bottles produced in this way show increased stability.

Besonders bevorzugt ist eine Ausführungsform der Erfindung, bei der die Einrichtung zum Kühlen und/oder Heizen ein Durchflußkanal für ein Fluid ist, welcher mit einer Einrichtung zum Erzeugen eines Fluidstroms verbindbar ist. Ein solcher Durchflußkanal kann wahlweise mit einem aufgeheizten oder einem abgekühlten Fluid durchflossen werden, so daß dieser Kanal sowohl zum Heizen als auch zum Kühlen des Formlings verwendbar ist. Alternativ oder zusätzlich kann die Einrichtung zum Heizen eine Elektroheizung und/oder eine Infrarotbeleuchtung sein, welche in den Aufnahmefinger integriert sind. Auch ist es möglich, den Finger mit Hilfe einer Piezokühlung zu kühlen.Particularly preferred is an embodiment of the invention, wherein the means for cooling and / or heating is a flow channel for a fluid, which is connectable to a device for generating a fluid flow. Such a flow channel can optionally be traversed by a heated or a cooled fluid, so that this channel is used both for heating and for cooling the molding. Alternatively or additionally, the device for heating may be an electric heater and / or an infrared lighting, which are integrated in the receiving finger. It is also possible to cool the finger with the help of a piezocooling.

Um zusätzlich eine Kühlung des Formlings von seiner Außenseite her zu erreichen, ist es vorteilhaft, wenn das Aufnahmesystem zusätzlich zu dem Aufnahmefinger eine Nachbehandlungshülse aufweist, welche relativ zu dem Aufnahmestift so bewegbar ist, daß sie den Aufnahmefinger sowie den darauf angeordneten Hohlkörperformling umschließt. Dabei ist es zweckmäßig, wenn die Nachbearbeitungshülse als Kavität ausgebildet ist, deren innere Wandung in etwa der äußeren Form des Hohlkörperformlings entspricht.In order additionally to achieve cooling of the molded article from its outside, it is advantageous if the receiving system has, in addition to the receiving finger, an after-treatment sleeve which is movable relative to the receiving pin so as to surround the receiving finger and the hollow body molding arranged thereon. It is expedient if the post-processing sleeve is formed as a cavity whose inner wall corresponds approximately to the outer shape of the hollow body molding.

Der Aufnahmefinger weist eine Halteeinrichtung für den Formling auf.The receiving finger has a holding device for the molding.

In der einfachsten Ausgestaltung weist eine solche Halteeinrichtung mindestens eine Öffnung in dem Aufnahmefinger auf, welche mit einer Vakuumeinrichtung verbindbar ist. So kann der Formling von dem Aufnahmefinger angesaugt und gehalten werden.In the simplest embodiment, such a holding device has at least one opening in the receiving finger, which can be connected to a vacuum device. Thus, the molding can be sucked and held by the receiving finger.

Um Deformationen des Formlings zu vermeiden, ist es insbesondere zweckmäßig, wenn das System darüber hinaus eine Abstandseinrichtung aufweist, die derart ausgebildet ist, daß der Großteil der Innenfläche des Formlings nicht mit der Außenfläche des Aufnahmefinger in Kontakt tritt.In order to avoid deformations of the molding, it is particularly expedient if the system moreover has a spacing device which is designed such that the majority of the inner surface of the molding does not come into contact with the outer surface of the receiving finger.

Besonders bevorzugt ist daher eine Ausführungsform, bei der die Abstandseinrichtung mindestens eine Öffnung in dem Aufnahmefinger umfaßt, welche mit einer Fluidzufuhr verbindbar ist. Mit Hilfe eines kontinuierlichen Fluidstroms wird der Formling auf einem Luftpolster in einem definierten Abstand zu dem Aufnahmefinger gehalten. Diese berührungslose Halterung des Formlings auf dem Aufnahmefinger minimiert die Deformationen, welche der Formling während des Entnehmens aus der Formkavität und/oder während des Abkühlprozesses erfährt. Dabei ist es zweckmäßig, wenn die Abstandseinrichtung zwischen der Innenfläche des Formlings und der Außenfläche des Aufnahmefingers einen Abstand von etwa 0,5 mm und bis etwa 10 mm vorzugsweise von 1 mm bis 5 mm gewährleistet.Particularly preferred is therefore an embodiment in which the spacer means comprises at least one opening in the receiving finger, which is connectable to a fluid supply. With the aid of a continuous fluid flow, the molding is held on an air cushion at a defined distance from the receiving finger. This non-contact mounting of the molding on the Pick-up finger minimizes the deformations experienced by the molding during removal from the mold cavity and / or during the cooling process. It is expedient if the spacer device between the inner surface of the molding and the outer surface of the receiving finger ensures a distance of about 0.5 mm and up to about 10 mm, preferably from 1 mm to 5 mm.

Wird die Abstandseinrichtung durch eine Öffnung in dem Aufnahmefinger gebildet, welche mit einer Fluidzufuhr verbindbar ist, so ist es zweckmäßig, wenn das Aufnahmesystem eine Einrichtung zum Heizen und/oder Kühlen des Fluidstroms aufweist. So kann das Abkühlen oder Aufheizen des Formlings unmittelbar durch den zur Halterung des Formlings verwendeten Fluidstroms dienen.If the spacer device is formed by an opening in the receiving finger, which can be connected to a fluid supply, then it is expedient for the receiving system to have a device for heating and / or cooling the fluid flow. Thus, the cooling or heating of the molding may serve directly through the fluid stream used to hold the molding.

Wird beim Kühlen oder Erwärmen des Hohlkörperformlings mit Hilfe eines Fluidstroms gleichzeitig der Aufnahmefinger, beispielsweise mit einer Elektroheizung oder -kühlung, gekühlt oder erwärmt, so wird eine homogene Temperierung des Formlings erreicht, da der Fluidstrom, der an dem Aufnahmefinger vorbeiströmt, trotz Wärmeaufnahme oder -abgabe durch den Hohlkörperformling auf einer in etwa konstanten Temperatur gehalten wird.If, during cooling or heating of the hollow body molding by means of a fluid flow simultaneously the receiving finger, for example, with electric heating or cooling, cooled or heated, a homogeneous temperature of the molding is achieved because the fluid flow past the receiving finger, despite heat absorption or - levied by the hollow body molding at an approximately constant temperature.

Bevorzugt ist eine Ausführungsform der Erfindung, bei der die mindestens eine Öffnung, welche mit einer Vakuumeinrichtung (als Halteeinrichtung) und/oder einer Fluidzufuhr (als Abstandseinrichtung) verbindbar ist, in der Nähe des ersten Endes des Fingers angeordnet ist.An embodiment of the invention is preferred in which the at least one opening, which is connectable to a vacuum device (as a holding device) and / or a fluid supply (as a spacer device), is arranged in the vicinity of the first end of the finger.

Insbesondere ist aber eine Ausführungsform der Erfindung bevorzugt, bei welcher der Aufnahmefinger zumindest abschnittsweise aus einem porösen Material besteht, das die mindestens eine Öffnung bildet. Auf diese Weise bildet sich beim Ausströmen eines Fluids durch das poröse Material ein Luftkissen, auf welchem der Formling gehalten ist.In particular, however, an embodiment of the invention is preferred in which the receiving finger is at least partially made of a porous material which forms the at least one opening. In this way, when a fluid flows through the porous material, an air cushion is formed on which the molded article is held.

Besonders bevorzugt ist eine Ausführungsform der Erfindung, bei welcher der Aufnahmefinger einen Anschlag für den Hohlkörperformling aufweist, so daß sich das offene Ende des Hohlkörperformlings auf diesem abstützt. Auf diese Weise wird verhindert, daß sich der Hohlkörperformling aufgrund der auf ihn einwirkenden Gravitation auf dem Aufnahmefinger über ein gewolltes Maß hinaus dehnt.Particularly preferred is an embodiment of the invention in which the receiving finger has a stop for the hollow body molding, so that the open end of the hollow body molding is supported on this. In this way it is prevented that the hollow body molding expands beyond a desired extent due to the gravity acting on it on the receiving finger.

In einer bevorzugten Ausführungsform ist der Anschlag einstellbar. Dadurch kann eingestellt werden, wie weit der Aufnahmefinger in den Hohlkörperformling eindringt. Dies ist insbesondere bei der Ausführungsform von Vorteil, bei der vorgesehen ist, daß der Hohlkörperformling nach dem Abkühlen möglichst flächig mit dem Aufnahmefinger in Kontakt tritt. Stellt sich nämlich während des Betriebes heraus, daß die Hohlkörperformlinge nach ihrem Abkühlen zu fest auf dem Aufnahmefinger sitzen und daher nur schwer entfernt werden können, kann der Anschlag derart verstellt werden, daß der Aufnahmefinger nicht mehr so weit in den Hohlkörperformling eintaucht. Wird nun die Außenkontur des Aufnahmefingers oder die Innenkontur des Hohlkörperformlings leicht konisch ausgebildet, so führt dies dazu, daß durch die Verstellung des Anschlages der Abstand zwischen "heißem" Hohlkörperformling und Aufnähmefinger eingestellt werden kann. Um so weiter der Aufnahmefinger in den Hohlkörperformling eintaucht, um so besser ist aufgrund des direkten Kontaktes zwischen Aufnahmefinger und "kaltem" Hohlkörperformling die Kühlung; jedoch sitzt dann der Hohlkörperformling auch um so fester auf dem Aufnahmefinger auf. Es ist daher ein Kompromiß zwischen guter Kühlleistung einerseits und guter Abnehmbarkeit des Hohlkörperformlings von dem Aufnahmefinger andererseits einzustellen.In a preferred embodiment, the stop is adjustable. This can be adjusted as far as the receiving finger penetrates into the hollow body molding. This is particularly advantageous in the embodiment in which it is provided that the hollow body molding after cooling occurs as flat as possible with the receiving finger in contact. If it turns out during operation that the hollow body moldings sit after their cooling too tight on the receiving finger and therefore difficult to remove, the stop can be adjusted so that the receiving finger is not so far immersed in the hollow body molding. Will now the outer contour of the receiving finger or the inner contour of the hollow body molding slightly conical, this leads to the fact that the distance between the "hot" hollow body molding and Aufnähmefinger can be adjusted by the adjustment of the stop. The further the receiving finger dips into the hollow body molding, the better is the cooling due to the direct contact between the receiving finger and the "cold" hollow body molding; However, then sits the hollow body molding all the more firmly on the receiving finger. It is therefore a compromise between good cooling performance on the one hand and good removability of the hollow body molding of the receiving finger on the other hand set.

Besonders zweckmäßig ist es, wenn der Anschlag als Stützring oder Platte ausgeführt ist, welche den Aufnahmefinger in der Nähe des zweiten Endes des Aufnahmefingers ringförmig umfassen. Auf diese Weise kann sich das offene Ende des Hohlkörperformlings vollumfänglich abstützen.It is particularly expedient if the stop is designed as a support ring or plate which annularly surround the receiving finger in the vicinity of the second end of the receiving finger. In this way, the open end of the hollow body molding can be fully supported.

Der Aufnahmefinger weist eine Auswurfeinrichtung auf, die es ermöglicht, den abgekühlten Hohlkörperformling von dem Aufnahmefinger abzustreifen.The receiving finger has an ejection device, which makes it possible to strip the cooled hollow body molding of the receiving finger.

Eine solche Auswurfeinrichtung wird durch eine Öffnung in dem Aufnahmefinger gebildet, die mit einem Fluidstrom beaufschlagbar ist, so daß der Hohlkörperformling durch einen Fluidimpuls von dem Aufnahmefinger abgestreift werden kann.Such ejection device is formed by an opening in the receiving finger, which is acted upon by a fluid flow, so that the hollow body molding can be stripped by a fluid pulse from the receiving finger.

Zusätzlich kann die Auswurfeinrichtung eine Einrichtung aufweisen, welche den Aufnahmefinger in der Nähe seines unteren Endes umgreift und die axial entlang des Fingers bewegbar ist. Bei dieser Bewegung wird der Mündungsbereich des Hohlkörperformlings oder der Randbereich des Halsringes erfaßt und der Formling abgestreift.In addition, the ejection means may comprise means which surrounds the receiving finger in the vicinity of its lower end and which is axially movable along the finger. In this movement, the mouth region of the hollow body molding or the edge region of the neck ring is detected and stripped of the molding.

Dabei ist es vorteilhaft, wenn die Auswurfeinrichtung aus dem Stützring oder der Platte des Anschlags gebildet wird.It is advantageous if the ejection device is formed from the support ring or the plate of the stop.

Weitere Vorteile, Merkmale und Anwendungsmöglichkeiten der vorliegenden Erfindung werden anhand der folgenden Beschreibung einer bevorzugten Ausführungsform und der dazugehörigen Figuren deutlich.

Figur 1
zeigt schematisch eine bevorzugte Ausführungsform des erfindungsgemäßen Aufnahmesystems,
Figur 2
zeigt eine axiale Querschnittsansicht durch eine bevorzugte Ausführungsform des erfindungsgemäßen Aufnahmefingers.
Figur 3
zeigt eine radiale Schnittansicht durch den Aufnahmefinger aus Figur 2.
Figur 4
zeigt eine alternative Ausführungsform des Aufnahmesystems während des Auswerfens eines Satzes von Hohlkörperformlingen von den Kernen und während der Entnahme von Hohlkörperformlingen aus dem Werkzeug.
Figur 5
zeigt das Aufnahmesystem aus Figur 4 während der Übergabe der Hohlkörperformlinge an die Stifte zur Nachbehandlung.
Figur 6
zeigt eine weitere Ausführungsform des Aufnahmesystems.
Figur 7
zeigt eine weitere alternative Ausführungsform des Aufnahmesystems.
Figur 8
zeigt eine Ansicht des Aufnahmesystems aus Figur 7 bei geöffneter Schließeinheit.
Figur 9
zeigt eine weitere Ansicht des Aufhahmesystems aus den Figuren 7 und 8 während eines anderen Arbeitsschritts.
Further advantages, features and applications of the present invention will become apparent from the following description of a preferred embodiment and the accompanying figures.
FIG. 1
schematically shows a preferred embodiment of the recording system according to the invention,
FIG. 2
shows an axial cross-sectional view through a preferred embodiment of the receiving finger according to the invention.
FIG. 3
shows a radial sectional view through the receiving finger FIG. 2 ,
FIG. 4
shows an alternative embodiment of the picking system during the ejection of a set of hollow body moldings from the cores and during the removal of hollow body moldings from the tool.
FIG. 5
shows the recording system FIG. 4 during the transfer of the hollow body moldings to the pins for post-treatment.
FIG. 6
shows a further embodiment of the recording system.
FIG. 7
shows a further alternative embodiment of the recording system.
FIG. 8
shows a view of the recording system FIG. 7 with open clamping unit.
FIG. 9
shows a further view of the Aufhahmesystems from the FIGS. 7 and 8th during another work step.

Figur 1 zeigt schematisch das erfindungsgemäße Aufnahmesystem zur Nachbehandlung mehrerer in einer Spritzgießform hergestellter Hohlkörperformlinge, wobei die Beschreibung der Figur insbesondere die Funktionen des Aufnahmesystems innerhalb des Herstellungsprozesses darstellt. FIG. 1 shows schematically the recording system according to the invention for the aftertreatment of a plurality of hollow body moldings produced in an injection mold, wherein the description of the figure shows in particular the functions of the receiving system within the manufacturing process.

In der dargestellten Ausführungsform werden die in einer Spritzgießform einer Spritzgießmaschine hergestellten Hohlkörperformlinge 1 mit Hilfe einer Entnahmeplatte 2 aus den Formnestern der Spritzgießform entnommen. Die Hohlkörperformlinge 1 sind so genannte Vorformlinge oder Preforms für die Herstellung von PET-Flaschen. Die Preforms 1 werden mit Hilfe von Entnahmekavitäten 3 der Entnahmeplatte 2 aus den Formnestern der Spritzgießform entnommen. Dazu kann die Entnahmeplatte 2 in die Schließeinheit der Spritzgießmaschine hineinbewegt werden. Außerhalb der Spritzgießmaschine werden die Preforms 1 von der Entnahmeplatte 2 an das erfindungsgemäße Aufnahmesystem 4 übergeben. Dazu weist das Aufnahmesystem 4 Aufnahmefinger 5 auf, welche als Kern in das Innere der Preforms 1 eingreifen und die Preforms 1 halten. Die dargestellte Ausführungsform des Aufnahmesystems 4 weist vier Sätze 6 bis 9 von Aufnahmefingern 5 auf, welche auf einem drehbar gelagerten Würfel 10 angeordnet sind.In the illustrated embodiment, the hollow body moldings 1 produced in an injection mold of an injection molding machine are removed with the aid of a removal plate 2 from the mold cavities of the injection mold. The hollow body moldings 1 are so-called preforms or preforms for the production of PET bottles. The preforms 1 are removed by means of removal cavities 3 of the removal plate 2 from the mold cavities of the injection mold. For this purpose, the removal plate 2 can be moved into the closing unit of the injection molding machine. Outside the injection molding machine, the preforms 1 are transferred from the removal plate 2 to the receiving system 4 according to the invention. For this purpose, the receiving system 4 receiving finger 5, which engage as a core in the interior of the preforms 1 and hold the preforms 1. The illustrated embodiment of the receiving system 4 has four sets 6 to 9 of receiving fingers 5, which are arranged on a rotatably mounted cube 10.

In der dargestellten Ausführungsform ist je ein Satz von Aufnahmefingern 6 bis 9 auf einer der Seitenflächen des Würfels 10 angeordnet. In der willkürlich gewählten Ausgangsposition des Aufnahmesystems 4 befindet sich der Aufnahmefingersatz 6 in der Übergabeposition, in welcher die Aufnahmefinger 5 die Preforms 1 von der Entnahmeplatte 2 aufnehmen. Dazu wird wahlweise das Aufnahmesystem 4 oder die Entnahmeplatte 2 so bewegt, daß die Aufnahmefinger in das Innere der Preforms 1 hineinragen, diese festhalten und aus den Entnahmekavitäten 3 durch entsprechendes Verfahren des Aufnahmesystems 4 oder der Entnahmeplatte 2 herausnehmen.In the illustrated embodiment, a respective set of receiving fingers 6 to 9 is arranged on one of the side surfaces of the cube 10. In the arbitrarily chosen starting position of the receiving system 4, the receiving finger set 6 is in the transfer position, in which the receiving fingers 5 receive the preforms 1 from the removal plate 2. For this purpose, either the receiving system 4 or the removal plate 2 is moved so that the receiving fingers protrude into the interior of the preforms 1, hold them and take out of the removal cavities 3 by appropriate method of the receiving system 4 or the removal plate 2.

In einem darauffolgenden Arbeitsschritt wird der Würfel 10 des Entnahmesystems 4 derart gedreht, daß der nächste freie Satz 9 von Aufnahmefingern 5 in die Aufnahmeposition gedreht wird, während der mit Preforms 1 bestückte Satz 6 nun in die Position des Satzes 7 der Darstellung in Figur 1 gedreht wird. In dieser Position können die von den Aufnahmefingern 5 des Satzes 6 aufgenommenen Preforms 1 abkühlen. Ist die erforderliche Abkühlung erreicht, so werden die Preforms in der Abstreifposition, in der sich in Figur 1 der Satz 8 der Aufnahmefinger 5 befindet, gedreht. Hier werden die Preforms 1 von den Aufnahmefingern 5 abgestreift und können zur weiteren Verarbeitung, beispielsweise mit einem Förderband 11, abtransportiert werden.In a subsequent step, the cube 10 of the removal system 4 is rotated so that the next free set 9 of recording fingers 5 is rotated to the recording position, while the preforms with 1 set 6 now in the position of the sentence 7 of the representation in FIG. 1 is turned. In this position, the recorded from the receiving fingers 5 of the set 6 preforms 1 can cool. When the required cooling is achieved, the preforms are in the stripping position, in which FIG. 1 the set 8 of the receiving finger 5 is rotated. Here, the preforms 1 are stripped off the receiving fingers 5 and can be removed for further processing, for example with a conveyor belt 11.

Alternativ ist es möglich, den Würfel 10 derart zu drehen, daß die Verweildauer der Hohlkörperformlinge 1 auf den Fingern 5 verlängert wird. Dazu ist es erforderlich, daß jeder Preform während seiner Verweildauer auf einem Finger 5 zunächst in die Position des Satzes 7 und dann in die Position des Satzes 9 aus Figur 1 gebracht wird: Dazu sind zusätzliche Drehbewegungen des Würfels um 180° bzw. 270° erforderlich.Alternatively, it is possible to rotate the cube 10 such that the residence time of the hollow body moldings 1 on the fingers 5 is extended. For this it is necessary that each preform during its residence on a finger 5 first in the position of the sentence 7 and then in the position of the sentence 9 from FIG. 1 For this purpose, additional rotational movements of the cube by 180 ° or 270 ° are required.

Die dargestellte schematische Ansicht zeigt ein Aufnahmesystem mit vier Sätzen von jeweils 16 Aufnahmefingern 5, die in einer 4 x 12 Matrix auf den Seitenflächen des Würfels 10 des Aufnahmesystems 4 angeordnet sind. Andere Anordnungen der Aufnahmefinger sind möglich, wobei die Anzahl und Anordnung der Finger der Anzahl und Anordnung der Entnahmekavitäten der Entnahmeplatte entspricht.The illustrated schematic view shows a recording system with four sets of 16 recording fingers 5, which are arranged in a 4 x 12 matrix on the side surfaces of the cube 10 of the recording system 4. Other arrangements of the receiving fingers are possible, the number and arrangement of the fingers corresponding to the number and arrangement of the removal cavities of the removal plate.

Der besseren Übersicht halber sind in den nachfolgend beschriebene Figuren Elemente, die mit Elementen der Figur 1 identisch oder diesen ähnlich sind, mit gleichen bzw. gestrichenen Bezugszeichen bezeichnet.For the sake of clarity, in the figures described below are elements that with elements of FIG. 1 are identical or similar, denoted by the same or deleted reference numerals.

In den Figuren 4 und 5 ist eine alternative Ausführungsform des erfindungsgemäßen Aufnahmesystems 4' zur Nachbehandlung der Formlinge 1 dargestellt. Die Darstellungen in Figuren 4 und 5 zeigen neben dem Aufnahmesystem 4' auch die Schließeinheit 23 der Spritzgießmaschine sowie die Entnahmeplatte 2' des Systems.In the FIGS. 4 and 5 an alternative embodiment of the receiving system 4 'according to the invention for the aftertreatment of the moldings 1 is shown. The illustrations in FIGS. 4 and 5 show next to the receiving system 4 'and the closing unit 23 of the injection molding machine and the removal plate 2' of the system.

In Figur 4 ist die vertikale Schließeinheit 23 der Spritzgießmaschine im aufgefahrenen Zustand dargestellt. Dazu wurden zunächst die Kavitäten 24 der Formnester einerseits und die Kerne 25 sowie die Halsbacken 26 andererseits hydraulisch voneinander getrennt. Um die nach dem Auffahren der Form von den Halsbacken 26 auf den Kernen 25 gehaltenen Formlinge 1 entnehmen zu können, wurde die Entnahmeplatte 2' in die Schließeinheit 23 eingebracht, so daß die Aufnahmekavitäten 3 der Entnahmeplatte 2' unterhalb der Kerne 25 der Form angeordnet sind. Durch Auseinanderziehen der Halsbacken 26 werden die Formlinge freigegeben und sie werden durch die Schwerkraft von den Kernen entformt und in den Aufnahmekavitäten 3 der Entnahmeplatte 2' aufgenommen. Alternativ kann das Entformen von den Kernen auch pneumatisch, mit Hilfe einer Abstreifplatte oder mittels eines mit der Entnahmeplatte verbundenen Greifers erfolgen.In FIG. 4 is the vertical closing unit 23 of the injection molding machine shown in the extended state. For this purpose, first the cavities 24 of the mold cavities on the one hand and the cores 25 and the neck cheeks 26 on the other hand were hydraulically separated from each other. In order to be able to remove the moldings 1 held on the cores 25 after the mold has been driven up, the removal plate 2 'has been introduced into the closing unit 23, so that the receiving cavities 3 of the removal plate 2' are arranged below the cores 25 of the mold , By pulling apart the neck jaws 26, the moldings are released and they are removed by gravity from the cores and taken in the receiving cavities 3 of the removal plate 2 '. alternative The removal from the cores can also be done pneumatically, by means of a stripper plate or by means of a gripper connected to the removal plate.

Die in Abbildung 4 ebenfalls dargestellte dreistufige Nachkühlplatte weist Kühlfinger 5 auf, die in einem Abstand voneinander angeordnet sind, welcher gleich einem Drittel des Abstandes zwischen den Aufnahmekavitäten 3 der Entnahmeplatte 2' beträgt. Auf diese Weise wird bei der Übergabe der Formlinge von der Entnahmeplatte 2' an die Finger 5 der Nachkühlplatte 27 nur jeder dritte Finger 5 bestückt. Dieser Übergabevorgang von der Entnahmeplatte 2' an die Finger 5 des Aufnahmesystems ist in Figur 5 dargestellt. Dabei weist jeder Finger 5 einen gesondert ansteuerbaren Abstreifring 18 auf, so daß die Formlinge 1 auf den Fingern 5 selektiv ausgeworfen werden können. Auf diese Weise läßt sich das Aufnahmesystem 4' dreistufig betreiben, wobei während ein erster Satz von Formlingen 1 abgekühlt wird, auf der gleichen Platte 27 ein zweiter Satz von Formlingen aufgenommen wird, während kurz danach ein dritter, bereits abgekühlter Satz von Formlingen 1 auf ein Förderband 11 ausgeworfen wird.In the Figure 4 also shown three-stage cooling plate has cooling fingers 5, which are arranged at a distance from each other, which is equal to one third of the distance between the receiving cavities 3 of the removal plate 2 '. In this way, only every third finger 5 is equipped with the transfer of the moldings of the removal plate 2 'to the fingers 5 of the Nachkühlplatte 27. This transfer process from the removal plate 2 'to the fingers 5 of the receiving system is in FIG. 5 shown. In this case, each finger 5 has a separately controllable scraper ring 18, so that the moldings 1 can be selectively ejected on the fingers 5. In this way, the receiving system 4 'can operate in three stages, wherein while a first set of moldings 1 is cooled, on the same plate 27, a second set of moldings is added, while shortly thereafter, a third, already cooled set of moldings 1 on a Conveyor belt 11 is ejected.

Neben der Übergabe der Formlinge 1 von der Entnahmeplatte 2' an die Finger 5 der Nachkühlplatte 27 ist in Figur 5 die Schließeinheit 23 wieder im geschlossenen Zustand dargestellt, so daß im Werkzeug bereits der Spritzgießvorgang für den nächsten Satz von Formlingen 1 abläuft.In addition to the transfer of the moldings 1 of the removal plate 2 'to the fingers 5 of the Nachkühlplatte 27 is in FIG. 5 the closing unit 23 is again shown in the closed state, so that the injection molding process for the next set of moldings 1 already takes place in the mold.

In der Figur 6 ist eine weitere Ausführungsform des erfindungsgemäßen Aufnahmesystems 4" zum Abkühlen der Formlinge 1 zusammen mit der Schließeinheit 23 dargestellt. Das Aufnahmesystem besteht aus mehreren, in der dargestellten Ausführungsform aus drei Nachkühlplatten 28, welche nacheinander mit Hilfe der Entnahmeplatte 2' mit Hohlkörperformlingen bestückt werden. Dabei sind die Nachkühlplatten 28 in einer Regalanordnung vorgesehen, die es ermöglicht, daß immer ein Satz von Formlingen 1 abgekühlt wird, während ein Satz von Formlingen 1 von der Entnahmeplatte übergegeben wird, während ein weiterer Satz von Formlingen 1 ausgeworfen wird.In the FIG. 6 a further embodiment of the receiving system 4 "according to the invention for cooling the moldings 1 is shown together with the closing unit 23. The receiving system consists of several, in the embodiment shown, three aftercooling plates 28 which are successively equipped with hollow body moldings with the aid of the removal plate 2 ' For example, the aftercooling plates 28 are provided in a racking arrangement which allows one set of moldings 1 to be cooled while one set of moldings 1 is being transferred from the unloading plate while another set of moldings 1 is being ejected.

In der Figur ist ein sogenanntes Horizontalsystem dargestellt, bei dem sich die Formwerkzeughälften in horizontaler Richtung öffnen. Prinzipiell könnte aber auch ein Vertikalsystem verwendet werden.In the figure, a so-called horizontal system is shown, in which the mold halves open in the horizontal direction. In principle, however, a vertical system could also be used.

Während alle bisher dargestellten Ausführungsformen des Aufnahmesystems 4, 4', 4" eine Entnahmeplatte 2, 2' vorsehen, um die Formlinge 1 aus dem Werkzeug in der Schließeinheit 3 zu entnehmen und auf die Aufnahmefinger zu übergeben, weist die in den Figuren 8 bis 9 dargestellte, alternative Ausführungsform keine solche Entnahmeplatte auf. Die Funktion der Entnahmeplatte wird von den Nachkühlplatten 28' mitübernommen. Zu diesem Zweck sind die Nachkühlplatten 28' als in die Schließeinheit bewegbar und übernehmen dort direkt die Formlinge 1 aus den Kavitäten 24' der Form.While all embodiments of the receiving system 4, 4 ', 4 "shown so far" provide a removal plate 2, 2' in order to remove the shaped articles 1 from the tool in the closing unit 3 and to transfer them to the receiving fingers, the drawing in FIG FIGS. 8 to 9 illustrated, alternative embodiment no such removal plate. The function of the removal plate is taken over by the Nachkühlplatten 28 '. For this purpose, the aftercooling plates 28 'are movable as in the closing unit and take there directly the moldings 1 from the cavities 24' of the mold.

Während in Figur 7 die Schließeinheit 23 der Spritzgießvorrichtung noch geschlossen dargestellt ist und von einer der Nachkühlplatte 28' gerade Formlinge 1 ausgeworfen werden, zeigt Figur 8 die Schließeinheit 23 in geöffnetem Zustand. Dabei wurde eine der Nachkühlplatten 28' in die Schließeinheit hineinbewegt. Aus dieser Figur wird deutlich, daß wenn daran festgehalten werden soll, die Formnester von ihrem geschlossenen Ende her zu befüllen, diese Art der Entnahme eine Abkehr von den bisherigen Prinzipien des Formaufbaus erfordert. Nach dem Auffahren der Schließeinheit 23 verbleiben die geschlossenen Halsbacken 26' bei den Kavitäten 24' der Formnester, so daß auch die Formlinge 1 in den Kavitäten 24' verbleiben, während die Kerne 25' aus den Formlingen 1 herausgezogen werden. Nach dem Auseinanderziehen der Halsbacken 26' können die Formlinge, 1 von der Nachkühlplatte 28' aufgenommen werden. Dazu werden, wie in Figur 9 dargestellt, die Finger 5 der Platte 28' in die in den Kavitäten 24' der Form steckenden Hohlkörperformlinge 1 eingeführt. Nach dem Eintauchen der Finger 5 in die Innenräume der Finger 1 werden die Formlinge beispielsweise mit Hilfe eines Vakuums von den Fingern 5 gegriffen, aus den Kavitäten 24' entnommen und außerhalb der Schließeinheit 23 auf den gleichen Fingern 5 gekühlt.While in FIG. 7 the closing unit 23 of the injection molding apparatus is still shown closed and straight moldings 1 are ejected from one of the aftercooling plate 28 ' FIG. 8 the closing unit 23 in the open state. In this case, one of the aftercooling plates 28 'was moved into the closing unit. From this figure it is clear that if it is to be held to fill the mold nests from their closed end, this type of removal requires a departure from the previous principles of mold design. After opening the closing unit 23, the closed neck jaws 26 'remain in the cavities 24' of the mold cavities, so that the moldings 1 remain in the cavities 24 ', while the cores 25' are pulled out of the moldings 1. After pulling apart the neck jaws 26 ', the moldings, 1 can be taken up by the aftercooling plate 28'. For this, as in FIG. 9 illustrated, the fingers 5 of the plate 28 'inserted into the cavities 24' of the mold stuck hollow body moldings 1. Die beiden Blende 1 und 5 sind durch die in Fig. 2 dargestellt. After immersing the fingers 5 in the interiors of the fingers 1, the moldings are gripped for example by means of a vacuum of the fingers 5, removed from the cavities 24 'and cooled outside the clamping unit 23 on the same fingers 5.

Für ein detaillierteres Verständnis des Aufbaus der Aufnahmefinger 5 sowie deren Funktionsweise werden nun die Figuren 2 und 3 beschrieben.For a more detailed understanding of the structure of the receiving finger 5 and its operation will now be the FIGS. 2 and 3 described.

Figur 2 zeigt eine seitliche Schnittansicht eines Aufnahmefingers 5, sowie beispielhaft dessen Befestigung an einer Nachkühlplatte 28 des Aufnahmesystems 4. Ein identischer Finger kann auch für alle anderen Ausführungsformen von Nachkühlplatten oder Würfeln verwendet werden. Der Kern 12 des Aufnahmefingers 5 hat eine Außenfläche 13, die im wesentlichen der Form der inneren Oberfläche 14 der Preforms 1 entspricht. FIG. 2 shows a side sectional view of a receiving finger 5, and by way of example its attachment to a Nachkühlplatte 28 of the receiving system 4. An identical finger can also be used for all other embodiments of Nachkühlplatten or cubes. The core 12 of the receiving finger 5 has an outer surface 13 which substantially corresponds to the shape of the inner surface 14 of the preforms 1.

Um den Preform 1 auf dem Kern 12 des Aufnahmefingers 5 zu halten, ist in der dargestellten Ausführungsform ein Vakuumsystem vorgesehen. Über den im Inneren des Kerns 12 vorgesehenen Kanal 15, welcher im Bereich der Spitze 16 des Kerns 12 eine Öffnung in der äußeren Oberfläche 13 des Kerns 12 aufweist, wird ein Unterdruck angelegt. Dieser Unterdruck saugt den Boden des Preforms 1 an, so daß der Preform auf dem Kern 12 gehalten wird. Dieser Unterdruck kann in der Übergabeposition des Satzes 6 der Aufnahmefinger 5 aus Figur 1 auch dazu verwendet werden, die Preforms aus der Entnahmeplatte 2 herauszunehmen. Der Kanal 15 ist über einen Anschluß 17 wahlweise mit einer Vakuumeinrichtung zum Erzeugen eines Unterdrucks, wie zuvor beschrieben, oder mit einer Überdruckeinrichtung verbindbar. Zum Abstreifen des Preforms 1 von dem Kern 12 in der Position des Satzes 8 aus Figur 1 wird der Kanal 15 mit einem leichten Überdruck beaufschlagt, so daß der Preform 1 von dem Kern 12 abgestoßen wird.In order to hold the preform 1 on the core 12 of the receiving finger 5, a vacuum system is provided in the illustrated embodiment. Via the inside of the core 12 provided channel 15, which has an opening in the outer surface 13 of the core 12 in the region of the tip 16 of the core 12, a negative pressure is applied. This negative pressure sucks the bottom of the preform 1, so that the preform is held on the core 12. This negative pressure can in the transfer position of the set 6 of the receiving finger 5 off FIG. 1 also be used to remove the preforms from the removal plate 2. The channel 15 is connected via a connection 17 optionally with a vacuum device for generating a negative pressure, as described above, or with a pressure device connectable. For stripping the preform 1 from the core 12 in the position of the set 8 FIG. 1 the channel 15 is subjected to a slight overpressure, so that the preform 1 is repelled by the core 12.

Um größere Abziehkräfte zwischen dem Preform 1 und dem Kern 12 überwinden zu können, ist ein bewegbarer Stützring 18 vorgesehen, welcher den Kern 12 des Fingers 5 umgreift und auf dem sich der Hals 19 der Preform 1 abstützt. Der Stützring 18 kann entlang des Kernes 12 des Fingers 5 bewegt werden, so daß in Abstreifrichtung eine Kraft auf den Hals 19 des Preforms 1 ausgeübt wird.In order to overcome greater Abziehkräfte between the preform 1 and the core 12, a movable support ring 18 is provided, which surrounds the core 12 of the finger 5 and on the itself the neck 19 of the preform 1 is supported. The support ring 18 can be moved along the core 12 of the finger 5, so that a force is exerted on the neck 19 of the preform 1 in the stripping direction.

Der Stützring 18 dient darüber hinaus auch als Anschlag für den Rand des Flaschenhalses. Mit Hilfe des Stützrings wird festgelegt, wie weit der Kern 12 des Fingers in den Formling 1 eingreift. Da sowohl die innere Oberfläche des Preforms 14 als auch die äußere Oberfläche 15 des Fingers konische Körper definieren, bestimmt die Eindringtiefe des Kerns 12 in den Formling 1 maßgeblich die Entnahmekräfte, welche nach dem Abkühlen und daher nach der Schrumpfung des Formlings 1 erforderlich sind, um den Formling 1 von dem Kern 12 des Fingers abzuwerfen.The support ring 18 also serves as a stop for the edge of the bottle neck. With the help of the support ring is determined how far the core 12 of the finger engages in the molding 1. Since both the inner surface of the preform 14 and the outer surface 15 of the finger define conical bodies, the penetration depth of the core 12 into the molding 1 significantly determines the extraction forces required after cooling and therefore after shrinking of the molding 1 drop the blank 1 from the core 12 of the finger.

Der in Figur 2 dargestellte Kern 12 weist eine Wasserdurchflußkühlung auf, wobei um den Vakuum- bzw. Druckluftkanal 15 im Zentrum des Kerns 12 herum konzentrisch ein Zu- und Ablauf 20, 21 vorgesehen ist. Die radiale Anordnung der Kanäle 15, 20, 21 ist deutlich in einer horizontalen Schnittansicht des Aufnahmefingers 5 in Figur 3 zu sehen.The in FIG. 2 shown core 12 has a Wasserdurchflußkühlung, wherein around the vacuum or compressed air channel 15 in the center of the core 12 concentrically around an inlet and outlet 20, 21 is provided. The radial arrangement of the channels 15, 20, 21 is clearly in a horizontal sectional view of the receiving finger 5 in FIG. 3 to see.

Der Umfang der Außenfläche 13 ist in der dargestellten Ausführungsform an allen Stellen Entlang der Längsachse des Kerns 12 um etwa 0,1 mm kleiner als der Innendurchmesser des Preforms 1 im heißen Zustand, in dem der Preform 1 aus dem Formnest des Werkzeugs entnommen und an den Kühlfinger übergeben wird. Auf diese Weise sind auch nach der Schwindung des Materials der Preform 1 beim Abkühlen die Abstreifkräfte zwischen der inneren Oberfläche 14 des Preforms und der Außenfläche 13 des Kerns 12 so gering, daß der Preform 1 mit Hilfe der Druckluft durch den Kanal 15 und dem Abstreifring 18 von dem Finger entfernt werden kann.The circumference of the outer surface 13 is in the illustrated embodiment at all points along the longitudinal axis of the core 12 by about 0.1 mm smaller than the inner diameter of the preform 1 in the hot state in which the preform 1 removed from the mold cavity of the tool and to the Cold finger is passed. In this way, even after the shrinkage of the material of the preform 1 during cooling, the stripping forces between the inner surface 14 of the preform and the outer surface 13 of the core 12 are so small that the preform 1 with the aid of compressed air through the channel 15 and the scraper ring 18th can be removed from the finger.

Der in Figur 2 schematisch dargestellte Stützring 18 kann, wenn dies zweckmäßig ist, wie in Figur 1 dargestellt, durch eine Abstreifplatte, welche Bohrungen im Bereich der einzelnen Finger 5 aufweist, ersetzt sein. Durch eine einzige Bewegung der Platte können auf diese Weise alle Preforms auf den Fingern 5 eines Satzes von Fingern auf einmal abgestreift werden.The in FIG. 2 schematically illustrated support ring 18 may, if appropriate, as in FIG. 1 represented by a stripper plate, which has holes in the region of the individual fingers 5, to be replaced. In this way, by a single movement of the plate, all the preforms on the fingers 5 of a set of fingers can be scraped off at once.

Der Kern 12 des Aufnahmefingers 5 besteht in der dargestellten Ausführungsform aus einem einstückigen Hohlkörper. Der Hohlkörper ist in eine Ausnehmung 31 der Nachkühlplatte 28 eingesteckt und mit Hilfe eines Klemmrings 31, der mit der Nachkühlplatte 28 verschraubt ist, an der Nachkühlplatte befestigt. Dabei ist der Hohlkörper mit Hilfe eines O-Rings 30 gegen die Nachkühlplatte 28 gedichtet, so daß das Kühlfluid nicht aus der Nachkühlplatte 28 oder dem Finger 5 austreten kann. Die Kanäle 15, 20, 21 im Inneren des Kerns 12 werden von konzentrisch angeordneten Röhren 33, 34 gebildet. Dabei ist die radial äußere Röhre 33 derart angeordnet, daß ihre Außenwand einen Abstand zu dem Kern 12 aufweist, so daß der Rücklaufkanal 21 für das Kühlfluid gebildet wird. Die radial innere Röhre hat wiederum einen Abstand von der radial äußeren Röhre 33, so daß der Zulaufkanal 20 für das Kühlfluid gebildet wird. Die plattenseitigen Enden der Röhren 33, 34 sind derart in die Nachkühlplatte 28 eingepaßt, daß der Zulaufkanal 20 und der Rücklaufkanal 21 mit dem Einlaßkanal 35 bzw. dem Auslaßkanal 36 der Nachkühlplatte in Verbindung stehen. Die Röhren 33, 34 sind an ihren im Bereich der Spitze 16 des Kerns 12 liegenden Enden mit einer Zentrierplatte 37 verlötet. Die Zentrierplatte 37 ist mit Hilfe eines O-Rings 38 gegen den Kern 12 gedichtet. Die radial außenliegende Röhre 33 endet an der Zentrierplatte 37, wobei sie in diesem Bereich Durchbrechungsbohrungen 40 aufweist, die über ihren Umfang verteilt Verbindungen zwischen dem Zulaufkanal 15 und dem Rücklaufkanal 21 herstellen.The core 12 of the receiving finger 5 consists in the illustrated embodiment of a one-piece hollow body. The hollow body is inserted into a recess 31 of the aftercooling plate 28 and secured by means of a clamping ring 31 which is screwed to the Nachkühlplatte 28, to the aftercooling plate. In this case, the hollow body is sealed by means of an O-ring 30 against the Nachkühlplatte 28, so that the cooling fluid can not escape from the Nachkühlplatte 28 or the finger 5. The channels 15, 20, 21 in the interior of the core 12 are formed by concentrically arranged tubes 33, 34. In this case, the radially outer tube 33 is arranged such that its outer wall has a distance from the core 12, so that the return passage 21 is formed for the cooling fluid. The radially inner tube in turn has a distance from the radially outer tube 33, so that the feed channel 20 is formed for the cooling fluid. The plate-side ends of the tubes 33, 34 are such fitted in the aftercooling plate 28, that the inlet channel 20 and the return channel 21 with the inlet channel 35 and the outlet channel 36 of the Nachkühlplatte are in communication. The tubes 33, 34 are soldered at their ends lying in the region of the tip 16 of the core 12 with a centering plate 37. The centering plate 37 is sealed by means of an O-ring 38 against the core 12. The radially outer tube 33 terminates at the centering plate 37, wherein it has perforation holes 40 in this area, which produce connections distributed over the circumference between the inlet channel 15 and the return channel 21.

Die radial innenliegende Röhre 34 greift sowohl durch die Zentrierplatte 37 als auch durch die Spitze 16 des Kerns 12 hindurch, so daß sie eine Verbindung des Kanals 15 mit der Außenfläche 13 des Kerns 12 bildet. Dabei ist das Ende der Röhre 34 mit der Spitze 16 verlötet. Das plattenseitige Ende der Röhre greift in den Druckluft- bzw. Vakuumkanalanschluß 17 der Nachkühlplatte 28 ein. Dabei ist das Ende der Röhre 34 mit Hilfe eines O-Rings 39 gegen die Nachkühlplatte 28 gedichtet, so daß das Kühlfluid nicht in den Kanal 15 eindringen kann.The radially inner tube 34 engages both through the centering plate 37 and through the tip 16 of the core 12 so that it forms a connection of the channel 15 with the outer surface 13 of the core 12. In this case, the end of the tube 34 is soldered to the tip 16. The plate-side end of the tube engages in the compressed air or vacuum channel connection 17 of the aftercooling plate 28. In this case, the end of the tube 34 is sealed by means of an O-ring 39 against the Nachkühlplatte 28, so that the cooling fluid can not penetrate into the channel 15.

In dem Rücklaufkanal 21 können Verwirbelungseinrichtungen vorgesehen sein, die für eine turbulente Strömung innerhalb des Rücklaufkanals 21 sorgen, um eine bessere Kühlleistung zur Verfügung zu stellen. Die Verwirbelungseinrichtungen können beispielsweise Rippen sein. Alternativ ist es auch möglich die Wände des Rücklaufkanals mit einer Struktur zu versehen: Im einfachsten Fall kann die Oberfläche aufgerauht sein.In the return passage 21 swirling means may be provided which provide turbulent flow within the return passage 21 to provide better cooling performance. The turbulators may be ribs, for example. Alternatively, it is also possible to provide the walls of the return channel with a structure: In the simplest case, the surface may be roughened.

BezugszeichenlistReference numeral List

11
Formling/PreformMolding / preform
2, 2'2, 2 '
Entnahmeplatteremoval plate
33
Aufnahmekavitätreceiving cavity
4, 4', 4"4, 4 ', 4 "
Aufnahmesystemrecording system
55
Aufnahmefingerreceiving finger
66
Satz von AufnahmefingernSet of recording fingers
77
Satz von AufnahmefingernSet of recording fingers
88th
Satz von AufnahmefingernSet of recording fingers
99
Satz von AufnahmefingernSet of recording fingers
1010
Würfelcube
1111
Förderbandconveyor belt
1212
Kern des AufnahmefingersCore of the recording finger
1313
Außenfläche des KernsOuter surface of the core
1414
innere Oberfläche des Preformsinner surface of the preform
1515
Kanalchannel
1616
Spitze des Kerns 12Top of the core 12
1717
Kanalanschlußchannel connection
1818
Stützringsupport ring
1919
Hals des PreformsNeck of the preform
20, 2120, 21
Kanälechannels
2222
Abstreifplattestripper
2323
Schließeinheitclosing unit
24, 24'24, 24 '
Kavitätcavity
25, 25'25, 25 '
Kerncore
26, 26'26, 26 '
Halsbackeneck block
2727
dreistufige Nachkühlplattethree-stage aftercooling plate
28, 28'28, 28 '
NachkühlplatteNachkühlplatte
3030
O-RingO-ring
3131
Ausnehmungrecess
3232
Klemmringclamping ring
33, 3433, 34
Röhretube
3535
Einlaßkanalintake port
3636
Auslaßkanaloutlet channel
3737
Zentrierplattecentering
3838
O-RingO-ring
3939
O-RingO-ring

Claims (7)

  1. System consisting of an injection molding mold for producing hollow body moldings, wherein the injection molding mold comprises a core, which defines the inner surface of the hollow body molding, and a post-treatment system (4) for the post-treatment of a hollow body molding (1) produced in the injection molding mold, wherein the system has a receiving finger (5) with a first end and a second end and wherein the receiving finger (5) is so designed that it can engage into the hollow body molding (1), wherein the outside shape of the receiving finger (5) substantially corresponds to the inside shape of the hollow body molding (1) so that the receiving finger (5) can hold the hollow body molding, wherein the outside diameter of the receiving finger (5) is substantially equal to the inside diameter of the hollow body molding (1) in the cooled condition so that the hollow body molding (1) can be removed from the receiving finger (5) even after shrinkage, characterised in that the injection molding mold and the receiving finger are adapted in such a way that the outside diameter of the receiving finger (5) is between 0.1 mm and 0.5 mm smaller than the inside diameter of the hollow body molding (1) in the removal condition so that the hollow body molding (1) can be removed from the receiving finger (5) even after shrinkage, wherein the receiving finger has a holding means (15, 18) for holding the hollow body molding (1), which has at least one opening in the receiving finger (5), which can be connected to a vacuum means, wherein the receiving finger (5) has an ejection means (18, 22) which makes it possible for the cooled hollow body molding (1) to be stripped from the receiving finger, wherein the ejection means has at least one opening in the receiving finger, which can be acted upon with a fluid flow so that the hollow body molding can be stripped from the receiving finger.
  2. A system (4) as set forth in claim 1 characterised in that the post-treatment system comprises a means for cooling and/or heating the hollow body molding (1) so that the hollow body molding (1) can be selectively cooled or heated by means of the system, wherein preferably the means for cooling and/or heating the hollow body molding (1) has a means for producing a cooled or heated fluid flow and particularly preferably the means for cooling and/or heating has a through-flow passage (20, 21) for a fluid, which is arranged in the receiving finger (5) and which can be connected to the means for producing a cooled or heated fluid flow, or the heating means has an electrical heating means.
  3. A system (4) as set forth in one of claims 1 through 2 characterised in that the receiving finger (5) has a spacing means which is so adapted that it so holds the hollow body molding that the large part of the inside surface of the molding does not come into contact with the outside surface of the receiving finger, wherein preferably the spacing means includes at least one opening in the receiving finger (5), which can be connected to a fluid feed, wherein particularly preferably the at least one opening is arranged in the proximity of the first end of the receiving finger (5) and/or the receiving finger at least portion-wise comprises a porous material which has the at least one opening.
  4. A system (4) as set forth in one of claims 1 through 3 characterised in that the receiving finger (5) has an abutment for a hollow body molding (1) so that the open end of the hollow body molding (1) can be supported thereon, wherein preferably the abutment is formed by a ring (18) or a plate (22) which embraces the receiving finger (5) in the proximity of its second end so that the open end of the hollow body molding (1) is supported thereon over its entire periphery.
  5. A system (4) as set forth in one of claims 1 through 4 characterised in that there is provided a post-treatment sleeve which is movable relative to the receiving pin so that it embraces the receiving finger and the hollow body molding arranged thereon, wherein preferably the post-treatment sleeve is in the form of a cavity, the inside wall of which approximately corresponds to the outside shape of the hollow body molding (1) and/or the post-treatment sleeve is of such a configuration that it does not touch the hollow body molding (1).
  6. A system (4) as set forth in one of claims 1 through 5 characterised in that the post-treatment system is adapted to receive the hollow body molding (1) outside the closure unit of the injection molding machine, wherein the system (4) is so adapted that it takes over the hollow body molding (1) from a removal plate (2) or that it is designed as a removal plate for removal of the hollow body molding (1) from an injection molding tool in the interior of the closure unit of an injection molding machine.
  7. A system (4) as set forth in one of claims 1 through 6 characterised in that there is provided at least one arrangement (6, 7, 8, 9) of receiving fingers (5), wherein the number of receiving fingers in the arrangement (6, 7, 8, 9) corresponds to the number of hollow body moldings simultaneously produced in the injection molding apparatus or an integral multiple thereof, so that all hollow body moldings (1) simultaneously produced in an injection molding apparatus are received by the arrangement (6, 7, 8, 9), wherein preferably a plurality of and preferably four arrangements (6, 7, 8, 9) of receiving fingers (5) arranged on a rotatable holding means are provided so that the system can successively receive a plurality of sets of simultaneously produced hollow body moldings (1) on the receiving fingers of the various arrangements by rotation of the holding means.
EP07704510.2A 2006-02-18 2007-02-09 Receiving system Not-in-force EP1984161B1 (en)

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DE102006007639A DE102006007639A1 (en) 2006-02-18 2006-02-18 recording system
PCT/EP2007/051297 WO2007093566A1 (en) 2006-02-18 2007-02-09 Receiving system

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EP1984161B1 true EP1984161B1 (en) 2015-10-14

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DE (1) DE102006007639A1 (en)
WO (1) WO2007093566A1 (en)

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US20110042855A1 (en) 2011-02-24
US9211668B2 (en) 2015-12-15

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